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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-25782] Allow SORT_MERGE plans even if some children are FETCH stages rather than IXSCAN stages</title>
                <link>https://jira.mongodb.org/browse/SERVER-25782</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.9/src/mongo/db/query/planner_analysis.cpp#L114-L122&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;planner only considers an OR plan eligible for explodeForSort() if its children are all &lt;tt&gt;IXSCANs&lt;/tt&gt;&lt;/a&gt;.  In theory a &lt;tt&gt;FETCH&lt;/tt&gt; shouldn&#8217;t prevent a &lt;tt&gt;SORT_MERGE&lt;/tt&gt; plan from being eligible.&lt;/p&gt;

&lt;p&gt;The attached explain from 3.2.4 seems to demonstrate the problem.  Rather than leveraging the index to create a &lt;tt&gt;SORT_MERGE&lt;/tt&gt; plan, a &lt;tt&gt;SORT&lt;/tt&gt; plan is generated as a result of the &lt;tt&gt;FETCH&lt;/tt&gt; required to satisfy the {&lt;tt&gt;$exists:false&lt;/tt&gt;} filter.&lt;/p&gt;</description>
                <environment></environment>
        <key id="311617">SERVER-25782</key>
            <summary>Allow SORT_MERGE plans even if some children are FETCH stages rather than IXSCAN stages</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</assignee>
                                    <reporter username="christopher.harris@mongodb.com">Chris Harris</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>storch</label>
                    </labels>
                <created>Wed, 24 Aug 2016 19:37:52 +0000</created>
                <updated>Mon, 7 Feb 2022 09:27:50 +0000</updated>
                            <resolved>Mon, 10 Aug 2020 14:12:59 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>1</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="3330568" author="xgen-internal-githook" created="Mon, 10 Aug 2020 14:10:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25782&quot; title=&quot;Allow SORT_MERGE plans even if some children are FETCH stages rather than IXSCAN stages&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25782&quot;&gt;&lt;del&gt;SERVER-25782&lt;/del&gt;&lt;/a&gt; Allow SORT_MERGE plans even if some children are FETCH stages rather than IXSCAN stages&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/29f94f2e7695b46437e313e264e83e50b3f7b9c1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/29f94f2e7695b46437e313e264e83e50b3f7b9c1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3056678" author="louis.williams" created="Mon, 27 Apr 2020 15:35:04 +0000"  >&lt;p&gt;I have a patch for this &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/257642/257642_server-25782&quot; title=&quot;server-25782 attached to SERVER-25782&quot;&gt;server-25782&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; that I never extensively verified.&lt;/p&gt;</comment>
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                            <attachment id="136349" name="explain.txt" size="11466" author="christopher.harris@mongodb.com" created="Wed, 24 Aug 2016 19:37:52 +0000"/>
                            <attachment id="257642" name="server-25782" size="9322" author="louis.williams@mongodb.com" created="Mon, 27 Apr 2020 15:34:19 +0000"/>
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